Robert Graham Men's Constantin-Short Sleeve Woven Shirt 100% Cotton Imported Machine Wash It's not an optical illusion-this shirt really is that cool a spectrum of color in a kaleidoscope pattern pops against a simple stone-gray background to make a style statement that won't be forgotten all summer long. It's not an optical illusion-this shirt really is that cool a spectrum of color in a kaleidoscope pattern pops against a simple stone-gray background to make a style statement that won't be forgotten all summer long.